2004 Pontiac Grand Am misfiring

My car began jerking at a light yesterday pretty bad. Replaced all spark plugs and wires. Still misfiring and difficulty accelerating. CEL is flashing. Checked all spark plugs and wires and they are good. Don't know what else to look at.

May want to run some fuel injection cleaner threw the gas tank also, here is a note from GM fuel injection cleaners...GM UPPER ENGINE AND FUEL INJECTOR CLEANER is the
only injector cleaning agent approved for use with
General Motors fuel system
components. Other
injector cleaners may cause damage to plastics, plated metals or
bearings. General Motors has
completed extensive laboratory testing of GM
Upper Engine and Fuel Injector Cleaner,
and can assure its compatibility
with General Motors fuel system components.

I have a 2004 Pontiac Grand Am 3.4 6cyl. We recently replaced the water pump,
serpentine belt and we had to cut off the heater core to the car. The car only runs cold ac
now but it has been overheat...

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